Which of the following are true of retrotransposons? I....

Which of the following are true of retrotransposons? I. They insert an RNA copy into the genome. II. They act via a "copy-and-paste" mechanism. III. They encode the enzyme reverse transcriptase. IV. They act via a "cut-and-paste" mechanism. A. I and III only are true B. I and II only are true C. II and III only are true D. II and IV only are true

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00:01 Which of these are true of retro transposons? so we have three statements here.

00:06 The first, they insert an r &a copy into the genome.

00:10 The second, they act via a copy and paste mechanism.

00:13 The third, they encode reverse transcriptase.

00:16 The fourth, they act via a cut and paste.

00:19 So is it 1 and 3 are true? 1 and 2 are true? 2 and 3 are true, or 2 and 4 are true.

00:28 So a retro transposon is a type.

00:30 Of transposable elements, and specifically it is one that is rna and has to be reverse transcribed into the dna.

00:40 So it's rna that needs to be reverse transcribed to integrate with the dna genome.

00:49 So because of that, it definitely encodes reverse transcriptase, because that's the enzyme that carries this out.

00:56 So encodes reverse transcriptase.

00:59 Because that's one of the requirements for this to work.

01:03 So what they do is they form these ribonuclear protein complexes, and those undergo reverse transcription, and you get integration of your new dna into the genome.

01:18 So you have the code, which is found in the dna, is transcribed, translated, and then reverse transcribes itself into another part of the genome.

01:30 Which means, is it cut and paste or copy and paste? well, it's copy and paste, because the original copy is still in the dna...

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